Image Wireless USB Handheld Finger Trackball Mouse with Laser Pointer Wireless, Charged by AAA battery (not included), plug and play, easy to install.Easy to use - left or right hand, or cradled between both. Press then appear laser pointer for presentation Off table and without limitation of operational space. Scrolling function can be controlled simply by your thumb. USB 2.0 interface, plug and play, no software required Special design, which can avoid any harm on your wrist and muscle, greatly reducing the chances for Arthritis and CTS suffers Ideal for both laptops and desktops. Place end of index or middle finger on trigger button & thumb on roller ball Package Included: 1 x Wireless Finger HandHeld USB Trackball Mouse with Laser Pointer, 1 x USB Receiver, 1xbag